package com.sky.aspect;


import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 *
 * 自定义切面，实现公共字段自动填充逻辑
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     *
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..))&&@annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行公共字段开始填充....");
       //1、获取当前被拦截的方法上的数据库操作类型

        //方法签名对象
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        //获得方法上的注解对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        //获取操作数据库类型
        OperationType operationType = autoFill.value();

      //2、获取到当前被拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if (args==null||args.length==0){
            return;
        }
        Object entity = args[0];
        //3、准备赋值数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //4、根据当前不同的操作类型，为对应的属性通过反射来赋值
       if (operationType==OperationType.INSERT){
           //为4个公共字段赋值
           try {
               Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
               Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
               Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
               Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
               setCreateTime.invoke(entity,now);
               setUpdateTime.invoke(entity,now);
               setCreateUser.invoke(entity,currentId);
               setUpdateUser.invoke(entity,currentId);
           } catch (Exception e) {
               e.printStackTrace();
           }
               //通过反射给对象赋值

       }else if (operationType==OperationType.UPDATE){
           //为俩个公共字段赋值
        try {
            Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            setUpdateTime.invoke(entity, now);
            setUpdateUser.invoke(entity, currentId);
        }catch (Exception e){
            e.printStackTrace();
        }

       }
    }

}
